How to determine the repair size of cylinder?

If the cylinder wear exceeds the allowable limit or there are serious scratches, grooves and pits on the cylinder wall, the cylinder should be processed according to the repair size, and the piston and piston ring with the same size as the cylinder should be selected to restore the correct geometry and normal fit clearance.

The repair size of cylinder is usually divided into six grades, which is based on the standard size of cylinder diameter, and each grade is increased. 0.25m. It is the first class, and gradually increases to1.50mm. Under normal circumstances, it generally exceeds the first class repair size. Table 2-3 shows the repair dimensions of several common automobile engine cylinders. To determine the repair size of the cylinder, the maximum worn cylinder diameter plus machining allowance (diameter is 0. 10-0.20mm), and then decided to choose the same repair size.